Question

a body of mass 1 kg is moving with a speed of 40 metre per second calculate its kinetic energy​

Answer 1

as K.E=1/2mv^2

so the units ,m=1kg

v=40m/s

now the K.E=1/2×40^2×1

=1600/2

=800

as K.E's unit is JOULES OR J

SO,K.E=800J

Answer 2

K.E - 1/2mv^2
1/2x 1 x 40^2
= 800 J